Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 79
ider the general case of an oblique cone, and placeits base in V, as shown in Fig. 134. Let a* be the givenprojection of a point on the surface of the cone. Drawthe projections of the element containing this point, asB* and B. The V trace of the required plane, S is tangentto the base of the cone… … Fio. 134. TANGENT PLANES 69 cone and a point of the V trace of the plane may be drawn,and its H trace used instead. Problem 55.—To pass a plane tangent to a given coneand containing a given point outside its surface. Suppose the base of the cone assumed in H. The tangentplane will contain the line…
Geometry, Descriptive
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
